examples/basic_kv_encryption.py
| 1 | """Basic single-tenant KV cache encryption example. |
| 2 | |
| 3 | Demonstrates: |
| 4 | 1. Establishing a TenantSession for one tenant. |
| 5 | 2. Encrypting 3 KV cache entries (simulating 3 token positions). |
| 6 | 3. Decrypting them back and verifying round-trip. |
| 7 | 4. Printing the audit log. |
| 8 | """ |
| 9 | |
| 10 | from __future__ import annotations |
| 11 | |
| 12 | import os |
| 13 | |
| 14 | from pqc_kv_cache import ( |
| 15 | CacheDecryptor, |
| 16 | CacheEncryptor, |
| 17 | EntryMetadata, |
| 18 | KVAuditLog, |
| 19 | KVCacheEntry, |
| 20 | TenantIdentity, |
| 21 | establish_tenant_session, |
| 22 | ) |
| 23 | |
| 24 | |
| 25 | def main() -> None: |
| 26 | tenant = TenantIdentity(tenant_id="tenant-alice", display_name="Alice Corp") |
| 27 | session = establish_tenant_session(tenant) |
| 28 | print(f"Session established: {session.session_id}") |
| 29 | print(f"Algorithm: {session.algorithm}") |
| 30 | print(f"Expires at: {session.expires_at}") |
| 31 | |
| 32 | encryptor = CacheEncryptor(session) |
| 33 | decryptor = CacheDecryptor(session) |
| 34 | audit = KVAuditLog() |
| 35 | |
| 36 | # Simulate encrypting K/V for 3 token positions in layer 0 |
| 37 | encrypted_entries = [] |
| 38 | originals: list[KVCacheEntry] = [] |
| 39 | for pos in range(3): |
| 40 | meta = EntryMetadata( |
| 41 | tenant_id=tenant.tenant_id, |
| 42 | session_id=session.session_id, |
| 43 | layer_idx=0, |
| 44 | position=pos, |
| 45 | token_id=1000 + pos, |
| 46 | ) |
| 47 | entry = KVCacheEntry( |
| 48 | metadata=meta, |
| 49 | key_tensor_bytes=os.urandom(64), |
| 50 | value_tensor_bytes=os.urandom(64), |
| 51 | ) |
| 52 | originals.append(entry) |
| 53 | enc = encryptor.encrypt_entry(entry) |
| 54 | audit.log_encrypt( |
| 55 | tenant.tenant_id, |
| 56 | session.session_id, |
| 57 | meta.layer_idx, |
| 58 | meta.position, |
| 59 | enc.sequence_number, |
| 60 | ) |
| 61 | encrypted_entries.append(enc) |
| 62 | print(f"Encrypted pos={pos} seq={enc.sequence_number} ct_bytes={len(enc.ciphertext) // 2}") |
| 63 | |
| 64 | # Decrypt and verify |
| 65 | for orig, enc in zip(originals, encrypted_entries): |
| 66 | dec = decryptor.decrypt_entry(enc) |
| 67 | assert dec.key_tensor_bytes == orig.key_tensor_bytes |
| 68 | assert dec.value_tensor_bytes == orig.value_tensor_bytes |
| 69 | audit.log_decrypt( |
| 70 | tenant.tenant_id, |
| 71 | session.session_id, |
| 72 | orig.metadata.layer_idx, |
| 73 | orig.metadata.position, |
| 74 | enc.sequence_number, |
| 75 | success=True, |
| 76 | ) |
| 77 | print(f"Decrypted pos={orig.metadata.position} OK") |
| 78 | |
| 79 | print("\nAudit log entries:") |
| 80 | for entry in audit.entries(limit=10): |
| 81 | print(f" {entry.timestamp} {entry.operation:8s} seq={entry.sequence_number}") |
| 82 | |
| 83 | |
| 84 | if __name__ == "__main__": |
| 85 | main() |
| 86 | |